Hire React.js developers with Ultragenius

At Ultragenius, we understand how taxing and tedious the hiring process for suitable React.js developers could be.

  • We provide you with a quick and efficient 1-click solution which allows you to hire the top talent from around the world within 72 hours.
  • Our blockchain technology ensures that your company finds the right talent for the right project in an effortless manner. We have rigorous screening tests in place to guarantee you the most talented developer for your business project at the right time.
  • Ultragenius has built a community of incredible developers that work remotely and excel in their skills remarkably!

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What is React.js?

React.js is prominently known for being a front-end library devised by Facebook. React.js allows users to create numerous, reusable UI and UX components. React.js is predominantly one of the most popular JavaScript libraries and possesses a strong foundation as well as an epic community administering it. The demand and need for React.js in the market as well as the realm of technology has grown considerably as it is easy to implement and is fast in nature.

Hire the top 1% among the 50K+ engineers
who have applied to ultragenius


Brian is a developer having 10+ years of experience in the design, development, testing, and maintenance of software systems. He  is an experienced full-stack web developer worked with a large variety of technologies.

React.js, Node.js, CSS, Angular.js, React Native

  • Additional Skills –
    Angular, Vue.js, Firebase, PHP
  • Working Experience –
    11 years
  • Availability –
    Full Time


Sam is a software engineer having 7+ years of experience in designing web applications and single page applications. He has worked in designing system architecture and working on scalability problems in product engineering teams.

React.js, Node.js, PHP, AWS, Docker, Kubernetes

  • Additional Skills –
    Angular, Vue.js, Firebase, PHP
  • Working Experience –
    11 years
  • Availability –
    Full Time


Ranjith is an experienced full-stack web developer with almost a decade of experience working with a large variety of technologies—over half of that working remotely. He also has detailed knowledge of backend development.

React.js, MongoDB, Node.js, Typescript, React Native, Redux

  • Additional Skills –
    Angular, Vue.js, Firebase, PHP
  • Working Experience –
    11 years
  • Availability –
    Full Time

What Ultragenius offers?

Ultragenius connects you with the top quality remote developers within no time.

Connect with the top 1% React.js developers at the low prices

Almost everyone prefers to use React.js for building native apps because of its significantly reduced load time. This open-source JavaScript framework provides a slick, smooth and interactive UIs to work with and design cost-efficient mobile apps for both Android and iOS phones . A React.js developer does the job of designing and maintaining the user interface components. But recruiting the best React.js developers is not an easy task where a large no. of developers are competing to grab the job opportunities.

How Ultragenius works?

Selection of right candidate

Selecting the candidates from a pool of 50K+ developers across 100+ skills to build the best team of developers for you.

In-depth profile creation

Find out the top talent with our resumes designed after detail analysis of developer’s skillset.

Candidates Screening

Ultragenius examines engineers by conducting rigorous interviews of the candidate and offer only the top 1% amoung 50K+ developers.

Onboarding alongwith finding out the best

Ultragenius also ensure you onboarding after finding the best match for your job role.

Live tracking of your engineer's work

With our automatic time tracking system, you can study your remote engineer’s in depth work.

Pay only after the trial period

We organize the management with international payments, biling visibility, and payment compliance.

Hire React.js Developers through Ultragenius in 4 easy steps

Tell us the skills you need

We’ll schedule a call and understand your requirements.

We find the best talent for you

Get the list of pre-vetted candidates in days.

Schedule the interviews

We will arrange a call after understanding your requirements.

Begin your trial

Start working with Ultragenius with a 2-week trial period.

Want to hire React.js developers on your own? Here are the skills you must look for

Hiring a React.js developer might be a complex task for you if you are from a non-technical background.   At present, it may be one of the the most demanding skills in technical field but hiring the best developers is not an easy task. 

Ultragenius is here to assist to all employers who choose to recruit React.js developers on their own. Hiring a developer on your own requires an in-depth knowledge of software development. The following skills you must look for in a React.js developer. 

Familiarity with the core HTML, CSS, and Javascript

React.js is designed for front-end development. The developer you are hiring must have core understanding of the HTML, CSS, and Javascript. Hire a React developer who can code and do the styling, having knowledge of Material UI and SASS, react components, external styling libraries.

  • Worked with HTML Tags, CSS pre-processors like SCSS, SASS, LESS, and designed highly interactive UI(s).
  • Thorough knowledge of JSX.
Javascript fundamentals + ES6

The developer must be clear about the fundamental concepts of Javascript language alongwith these ES6 skills –

  • Variables and scoping
  • Arrays and object
  • Array methods
  • Functions and arrow functions
  • DOM Manipulation and event handler
  • The “this” keyword
  • Tie “class” keyword
  • Prototype chain and object creation
  • Higher order functions and callback functions
Well conversant with JS build tools

While working with real-world projects, React developers need to install many packages and add dependencies, file watcher, browser reloader, and many more. The developers must have the knowledge of webpack , npm, and yarn.

Very good understanding of testing frameworks and tools

Rising quick-deployment needs during the development phase, testing has become an  important skill for React developers. Therefore, the developers should know about Jest, Enzyme, Mocha, Chai, AVA, and Tape for unit testing.

For end-to-end testing, they must know about Selenium, Webdriver, Cucumber.js, Nightwatch.js, Cypress, and Puppeteer.

For integration testing, they must know about Karma.

Familiarity with Agile Methodologies

The React developers you are going to hire  should be capable of testing-driven development and know about TDD, BDD, and Unit tests, and should know how to use any of the software testing tools among Jest, Enzyme, Jasmine, Karma, Mocha, and Selenium.

Knowledge of MVC architecture

React developers must know about MVC architecture. MVC approach helps you to create applications that separate the input logic, business logic, and UI logic while maintaining the loose coupling between the elements.

Proficient in writing clean and optimized code
You must hire the developers based on their ability to write clean and optimized code that is understandable by all the team members, and is scalable.
Experience working with React.js workflows

Very important point : State management in React.js is the biggest challenge developers face while dealing with the large applications. Look for the developers who have worked with projects where they have managed states across multiple components and optimized application performance.

Check if they are well-versed with the popular libraries like Redux, Mobx, and Context APIs. 

Pay only after the trial period

Want to work with the top talent across the world?

Top interview questions to ask when hiring an React.js developer

You know that finding the best match for the job role is directly proportional to the success of your project. Here are some sample questions you must ask a React.js developer while hiring –

React DOM is slow as compared to Virtual DOM. React DOM can directly update HTML while Virtual DOM doesn't directly update HTML. Real DOM creates a new DOM if the element updates while Virtual DOM updates the JSX if the element updates. Real DOM manipulation is very expensive while Virtual DOM manipulation is very easy.

JSX stands for Javascript XML. This is a type of syntax extension which allows us to directly write HTML in React by converting HTML into React components, which helps you to easily create user interfaces for your web applications.

The virtual DOM is a programming concept where a virtual representation of UI is kept in memory and synced with the real DOM with the help of a library like ReactDOM. This process is called "Reconciliation".

Whenever any data is changed in UI, the changes are rendered in Virtual DOM first, then Virtual DOM is compared with Real DOM, the Real DOM will be updated only with the things that have been changed.

React lets you use state and other React features without writing a class. It makes logic and UI separable easily. To change a functional component into a class component requires a little bit of refactoring, but with React hooks functional components have the capability of tapping into the state, so that the refactoring effort will be minimal.

The lifecycle of the component consists of four phases -

  • Initialization - The constructor() method is called before anything else when the component is initiated and sets up the initial state and other initial values. This method is called when your component is created but is not added to the DOM. Its main use is to initialize the state and bind this for component methods.
  • Mounting - The component is added to the React DOM. Mounting includes the following methods like constructor(), getDerivedStateFromProps(), render(), and componentDidMount().
  • Updating - The component receives changed props or states and is called when the components is re-rendered. Updating the component includes shouldComponentUpdate (), componentWillUpdate (), componentDidUpdate () methods.
  • Unmounting - The component is removed from the React DOM. It includes the method componentWillUnmount().

Far far away, behind the word

  • React increases the efficiency of an app by using Virtual DOM

    React uses Virtual DOM which is the virtual representation of the Real DOM, each time when the data changes in a React application, a new Virtual DOM is created instead of reloading the page every time.

  • Embedded JSX Feature

    React has an embedded feature of writing HTML inside Javascript, and place the HTML code in the DOM without using functions like createElement() or appendChild().

  • SEO-friendly User Interface

    React enables developers to develop engaging user interfaces that can be easily directed in search engines. React also allows server-side rendering, which improves the SEO of an application.

  • Components are reusable

    For developing applications, React uses component-based architecture. Components are independent and can be shared across various applications having similar functionality. The re-use of functionality enables developers to quickly design pages.

  • Offers a very rich Javascript library and supports handy tools

    React offers a vast Javascript library that provides developers more flexibility while designing web pages. React also allows developers to code and debug applications with the help of their native tools. React developer tools have been designed as extensions in Chrome and Firefox that easily allow you to inspect the React component hierarchies in the Virtual DOM. If the developers want to examine any component, they can select and edit their current props and state.

untains, far from the countries Vokalia and Consonantia, there live the blind texts. Separated they live in Bookmarksgrove right at the coast

Props stand for Properties in React. Props are the read-only components generally used to render dynamically generated data. Props are passed in the functions as similar as the arguments are passed. Props are always sent from parent to child component and never vice-versa.

  • Props are immutable while the States are mutable.
  • Props allow you to pass information from one component to another in the argument form, while a State doesn't pass but holds the information about the components.
  • Props make a component reusable by passing it to the child component while States do not have any functionality like this.
  • Props are external and are controlled by whatever renders the component while the State is internal and is controlled by the React Component itself.
  • Props are used to communicate between the components, States can be used for rendering dynamic changes with the component.

Each component must have a render() method. The render method returns a single React element which is the representation of the native DOM component.

To render more than one element, they must be grouped and enclosed inside the elements.

Hire Ultragenius Developers based on skills


Frequently Asked Questions

Ultragenius is the leading  platforms hiring the remote talent and connecting the most skilled developers with Silicon Valley businesses. We focus on finding the best talents who will perform extremely well and will be easily integrated into your teams. We filter out the developers after sending the links to the candidates with the job matching profile, they have to prove their self-reported experience mentioned in their resume by giving the actual skills tests.

Ultragenius first tests the developer’s skill set by conducting a two and half hour hiring test. Our first hiring test judges a candidate on all aspects like aptitude, case study analysis, verbal and reasoning, coding questions based on data structures and algorithms, software engineering, system design, and more. Then, there is another round for the candidates who are selected from this round called “Higher-level Assessment Skill Test”, which includes their video questions about their major skills and projects they have worked upon.

Fill up the form which is on every hiring developers’ page and we will inform you once we select the top skilled developer matching your job requirements. After analyzing the candidates based on their resumes and two assessment tests, we give you the results. And if the candidates are fit for your job role, then we also provide the onboarding.

Ultragenius offers you only the talented and most skilled developers who are selected among the top 1% among 50K+ developers who apply on our platform. After a rigorous selection and testing process, we sort out the top candidates for you. You can check out Ultragenius’ s selection process for hiring React.js developers on our website.

Ultragenius provides you the best facility to hire the best developers in more than 50 skills like Angular, Javascript, Node, Python, Magento, Ruby On Rails, Glong, PHP, DevOps, Machine Learning, and many more.